Complete fluid exchange system for automatic transmissions

ABSTRACT

An improved system for changing the fluid of vehicular automatic transmissions and the like, which has the capability to provide a complete fluid exchange faster and with less usage of fresh fluid in a manner that is easier to operate. This is accomplished by the system&#39;s unique capability to extract used fluid and replace it with fresh fluid at a faster, balanced rate than before possible in prior art. This is accomplished by decreasing or removing restriction from the exhausting of the used fluid and introducing fresh fluid at more than one locus. The unique, novel capability of the invention to use a dual use pan access tube to combine a static change with a dynamic change, and to introduce fresh fluid into the transmission from two different loci instead of one as in all prior art, allows the fluid exchange to be completed in a shorter time with less use of fluid. These improvements increase the commercial utility and value of complete fluid changing in automatic transmissions and should extend its commercial viability as a routine maintenance procedure in the vehicular or automotive industry.

RELATED APPLICATIONS

[0001] This application is a continuation of application Ser. No.08/772,836, filed Dec. 24, 1996, now U.S. Pat. No. 6,330,934, which wasa continuation of application Ser. No. 08/469,673, filed Jun. 6, 1995,and which was a continuation-in-part of application Ser. No. 08/209,061filed Mar. 9, 1994, granted U.S. Pat. No. 5,472,064, and now U.S.Reissue Pat. No. RE36,650, which was a continuation-in-part ofapplication Ser. No. 07/781,322 filed Oct. 23, 1991, now U.S. Pat. No.5,318,080, each related application being incorporated by referenceherein.

FIELD OF THE INVENTION

[0002] This invention relates generally to changing the fluid ofvehicular automatic transmissions and more specifically to a completestatic and dynamic combination of fluid flushing, purging, cleaning andreplacement of used transmission fluid with fresh fluid to the torqueconvertor, other typically inaccessible transmission components, and thetransmission as a whole.

OBJECTS AND ADVANTAGES

[0003] The new invention comprehensively coordinates the utilization ofboth static and dynamic fluid changing in a unique manner as a combinedmeans to effectively institute a Complete Fluid Exchange in the leastamount of time practical without harming the transmission or vehicle andwith the least use of fresh fluid feasible. These objects havesignificant commercial value.

[0004] Prior art in the area of dynamic fluid changing in automatictransmissions has been problematic in several serious ways that havelimited the commercial viability of its use in every day automotive andvehicular preventative maintenance. Previous devices have been difficultto connect in proper alignment to the vehicle, slow to operate, and tendto be wasteful by using too much fresh fluid due to dilution losses.Such devices tend to cause fluid starvation or overpressurizationproblems in the transmission, with the exception of Viken (U.S. Pat. No.5,318,080, Issued Jun. 7, 1994).

[0005] Viken's device, although not harmful to the vehicle was notconvenient for the operator. The primary objects of my invention are toinstitute a Complete Fluid Exchange in less time, with less fresh fluidsacrificed to unnecessary dilution losses, with minimal complexity inoperating the device including minimal difficulty connecting the deviceto the vehicle being serviced, and with no overpressurization,overfilling or fluid starvation conditions resulting.

[0006] This invention has the capabilities to accomplish these objectsby use of a unique Pan Access Tube used in combination with a two partfluid changing process comprised of a static fluid change and a dynamicfluid change.

[0007] During the static part of the Complete Fluid Exchange thisinvention utilizes a unique two part flushing and purging of areas thatcan be reached with the invention. The first part is comprised offlushing and purging used fluid out of the cooling line and itsdownstream transmission components into the transmission pan. The secondpart is comprised of the extraction of that purged fluid out of thetransmission pan by use of the Pan Access Tube.

[0008] During the static part of the Complete Fluid Exchange used fluidwhich has been forced into the pan is extracted by use of an auxiliarypump in combination with a Pan Access Tube which has been inserted downinto the bottom of the transmission pan through the dipstick-fillertube.

[0009] The net result of this art is that less fresh fluid is sacrificedto dilution losses. In some cases this reduction approaches 50% of thefresh fluid used. The time necessary for the Fluid Exchange is decreasedusing this art.

[0010] In both embodiments of this invention fresh fluid is not onlyintroduced into the transmission through its cooling return line duringthe static part of the Complete Fluid Exchange but also during thedynamic part of the Complete Fluid Exchange.

[0011] However, in the second and preferred embodiment, fresh fluid isintroduced into the transmission at two loci at the same timesimultaneously to balance its rate of flow with the used fluid beingexhausted from the opened cooling circuit with minimal or no resistanceapplied, the net result being a Complete Fluid Exchange in a shorterperiod of time.

[0012] Three important objects are obtained by using the Pan Access Tubeto introduce fresh fluid directly into the transmission pan incombination and coordination with the introduction of fresh fluid intothe cooling return line during the dynamic part of the Complete FluidExchange, while removing as much restriction as practical from theextraction means for used fluid. These objects consist of: 1—The staticand dynamic parts of the Complete Fluid Exchange are completed inshorter periods of time; 2—Less fresh fluid is used to provide aComplete Fluid Exchange than otherwise possible holding all otherfactors equivalent; 3—The Complete Fluid Exchange is instituted withoutdamaging the transmission or vehicle in any fashion due tooverpressurizing the transmission, overfilling it, or creating any typeof fluid starvation condition which could result in scoring and/orerosion of internal transmission components.

[0013] Another object of the use of the Pan Access Tube is to increasethe rate of introduction of fresh fluid into the transmission to matchthe greater rate at which used fluid is extracted when increased lowpressure is applied by the invention to the outlet side of the openedcooling circuit during the dynamic part of the Complete Fluid Exchange.

[0014] The invention has the capability to maintain an overall, ongoingbalance between the rate of fresh fluid introduced to the rate of usedfluid extracted during the dynamic part of the Complete Fluid Exchange.Because most or all restriction means are removed from the extraction ofused fluid from the outlet side of the opened cooling circuit, the FluidExchange procedure is significantly speeded up by use of this inventionover the prior art.

[0015] The unobvious and novel dual use of the Pan Access Tube featuredin this invention provides a means to extract used fluid present in thepan when the transmission is static in the first and second embodiments.But, it is also utilized to directly introduce clean fluid into the panduring the last part of the static fluid exchange and through the wholedynamic fluid exchange in the second and preferred embodiment.

[0016] The static part of the Complete Fluid Exchange is an initial partof the Complete Fluid Exchange and is in fact a partial fluid changebecause only certain parts of the transmission can be flushed, purgedand refilled when the transmission is not operating. But the use of thestatic exchange procedure prior to and comprehensively coordinated witha subsequent dynamic exchange can offer a never before available meansof shortening the length of time required for the Complete FluidExchange and can significantly decrease the overall amount of freshfluid utilized.

[0017] Use of a static fluid exchange before, in addition to, and incoordination with a dynamic fluid exchange allows a total exchange ofall used fluid for fresh fluid using the least amount of fresh fluidfeasible to attain the same effective results in the least amount oftime practical, holding all other factors equivalent.

[0018] Useful, unobvious objects attained by use of this inventioninclude but are not limited to increased speed, ease and totality of theFluid Exchange provided by the Complete Fluid Exchange. Increasedefficiency is obtained by using the minimum amount of fresh fluidfeasible to obtain the desired, effective results in the minimum amountof time, in as simple a manner as possible without any damage to thevehicle or the transmission.

[0019] For these reasons this invention can provide numerous commercial,technical, and consumer/customer benefits to the automotive maintenanceindustry.

[0020] Further objects and advantages of my invention will becomeapparent from a consideration of the drawings and ensuing description.

DESCRIPTION OF THE DRAWINGS

[0021]FIG. 1 is a representative illustration of the applicant's systemas it is typically positioned with respect to a vehicle being serviced.

[0022]FIG. 2 is a schematic illustration of the first and most basicembodiment interconnected to a vehicular automatic transmission to beserviced by the invention.

[0023]FIG. 3 is a schematic illustration of the second, preferredembodiment interconnected and positioned to a vehicular automatictransmission to be serviced by the invention.

SUMMARY OF THE INVENTION

[0024] The new invention utilizes an external pumping means as didViken's invention specified in U.S. Pat. No. 5,318,080 (Issued Jun. 7,1994) in both embodiments. But, in its preferred second embodiment, theexternal pumping system for fresh fluid is quite novel when compared toall other prior art since it is bifurcated into two separate butcoordinated sources of introducing fresh fluid into the transmission.These two separate but coordinated supply sources can be used tointroduce fresh fluid into the transmission at two separate loci at anyoverall rate needed to match the unrestricted or enhanced exhausting ofused fluid specified in the second preferred embodiment.

[0025] The invention introduces fresh fluid into the transmissionthrough the cooling return line and this is used in both of its twoembodiments during both the static part of the Complete Fluid Exchangeand during the dynamic part as well. The invention introduces freshfluid directly into the transmission pan through the dipstick/fillertube by means of the Pan Access Tube during the static part of theComplete Fluid Exchange in the second embodiment, and during the Dynamicpart of the Complete Fluid Exchange in the second embodiment. The Freshfluid introduced into the transmission from both sources is meteredtogether, that is, measured additively, and both are suitably regulatedindividually and together by utilizing a variable flow regulator valveand an adjustable relief valve used as a distribution proportioningvalve. Of course many other equivalent means can be used withoutdeparting from the art.

[0026] In order to maintain overall balance between the rate at whichused fluid is extracted and the rate at which fresh fluid is introducedduring the dynamic part of the complete fluid exchange, fresh fluid mustenter the transmission just as fast as the used fluid flows out of theopened cooling line which has had additional low pressure applied to itscooling outlet side in the second, preferred embodiment.

[0027] Lack of inclusion of additional illustrations of embodimentsclearly related to and based on this novel art, should not be construedas suggesting that they are not a part of the novel art of thisinvention.

[0028] This invention provides a Complete Fluid Exchange for AutomaticTransmissions consisting of: 1—The utilization and coordination of astatic fluid change which includes flushing, purging, cleaning of thepan and the cooling return line and its downstream circuits; and 2—Adynamic fluid exchange which includes the flushing, purging, cleaning ofthe remaining inaccessible components such as the torque convertor andother internal components which are only accessible with the use of thistype of apparatus with the transmission operating.

[0029] This invention institutes this Complete Fluid Exchange in asshort a period of time as feasible with the least amount of fluidutilized that is practical.

[0030] This invention provides the means to unequivocally replace theused fluid extracted during both the static and dynamic phases of theComplete Fluid Exchange in a coordinated, systematically controlledmanner.

[0031] This invention provides the coordinated means to refill anautomatic transmission in as short a time as feasible using the minimumamount of fresh fluid practical without creating any fluid starvation orother potentially harmful conditions in the transmission or vehicleduring the dynamic part of the Complete Fluid Exchange.

[0032] Because the Complete Fluid Exchange System utilizes enigmatic,unobvious and novel art to attain these utilitarian and commerciallyuseful results, it is therefore distinctly patentable. Each of the twoembodiments of the invention specified in FIGS. 2 and 3 incorporate theuse of a unique Pan Access Tube, which serves as a used fluid extractionmeans in both embodiments during the static phase of the Complete FluidExchange. It also serves with a second, dual use as an additional,coordinated means of fresh fluid introduction at a second locus duringthe dynamic phase of the Complete Fluid Exchange in the second preferredembodiment.

[0033] The invention provides an apparatus comprised of but not limitedto: a source of fresh fluid and means to apply pressure to introducethat fresh fluid into the transmission at more than one locus; areservoir to receive used fluid extracted from the transmission at morethan one locus; a means to apply low pressure to these extraction locisuch that used fluid is extracted from them; a means to measure andbalance the flow rate and volume of fresh fluid introduced into thetransmission and during the dynamic part of the fluid exchange the flowrate and volume of used fluid extracted from the transmission such thatfresh fluid is simultaneously exchanged with used fluid at the sameapproximate rate without causing any starvation conditions or otherpotentially harmful conditions in any internal transmission componentduring the dynamic part of the Complete Fluid Exchange when thetransmission is running, or during the static part of the Complete FluidExchange before the dynamic part of the exchange is instituted.

[0034] In summary, the invention has the capability to institute aComplete Exchange of fresh fluid for used fluid in the shortest timepractical using the minimum amount of fresh fluid. It also has thecapability of maintaining a balanced rate of flow between the freshfluid being introduced and the used fluid being extracted. It has thecapability to institute virtually a complete flushing and purging ofused fluid with an essentially complete cleaning of the transmission. Italso provides the operator with an easy to operate apparatus which canbe used conveniently to attain the desired results which the CompleteFluid Exchange offers. These novel contributions to the art of changingfluid in automatic transmissions make the invention commercially usefuland patentable.

[0035] Further objects and advantages of my invention will becomeapparent from a consideration of the drawings and ensuing description ofeach.

[0036] Description of the Complete Fluid Exchange System inPosition—FIG. 1

[0037]FIG. 1 is a representative illustration of a Complete FluidExchange System 20 as it is typically positioned with respect to avehicle being serviced. Complete Fluid Exchange System 20 isinterconnected via a pair of interchangeable input/output hoses (aninput/output hose 4 and an input/output hose 5) to a vehicle 7 beingserviced which has an automatic transmission 9.

[0038] Hoses 4 & 5 are connected to either side opened cooling circuit(not shown) of vehicle 7 which connects to and runs through atransmission cooler 11 which is an integral part of a radiator 13. Thisis done by making random connection to a pair of quick connect stems (aquick connect stem 10 and a quick connect stem 12) which have beeninterconnected to the cooling circuit. A Pan Access Tube 15 has beeninserted down into a transmission pan 19 via a transmissiondipstick/filler tube 18. A used fluid receptacle 21 is used to receivethe used fluid extracted from transmission 9 by the Complete Total FluidExchanger 20. A fresh fluid receptacle 23 is used to supply the freshfluid which the Invention will introduce into transmission 9. Receptacle23 is also used to supply the fresh fluid to pan 19 from a Pan AccessTube 15 in the second embodiment illustrated in FIG. 3. A control panel25 is located on the front top of The Complete Fluid Exchange System.

[0039] Description of the Complete Fluid Exchange System—FIG. 2—TheFirst Embodiment

[0040]FIG. 2 is an illustration of the first embodiment of the TheComplete Fluid Exchange System which is randomly interconnected to bothsides of an opened fluid cooling circuit 27/11/29, designated as27/11/29 because before being opened it is comprised of a cooling outletline 27, a transmission fluid cooler 11 inside a radiator 13 and acooling return line 29, each of which form together a connected,complete cooling circuit of transmission 9. Input/output hoses 4 & 5 areshown interconnected to both sides of cooling circuit 27/11/29. Hose 4is connected to line 29 at connector 30, through stem 10 which isconnected to hose 4 by quick connector 14. Stem 10 is connected to theend of line 29 at connector 30 after connector 30 has been disconnectedfrom a port 28 of cooler 11 (as an alternative choice, a port 26 ofcooler 11 can be disconnected for the interconnection location ifpreferred by the operator). Hose 5 is connected to line 27 through stem12 which is connected to hose 5 by quick connector 16 which is connectedto opened port 28 of cooler 11, thereby connecting hose 5 to atransmission cooler 11 located in radiator 13.

[0041] Input/output hoses 4 & 5 are connected to two different ports,one each, of a flow alignment valve 45.

[0042] One end of Pan Access Tube 15 is connected to an auxiliary pumpsuction port 34 of an auxiliary pump assembly 35 with the other end oftube 15 inserted down dipstick/filler tube 18 into and down to thebottom of pan 19. Auxiliary pump 35 can be activated by an electricpower supply switch 96, and when activated pump 35 delivers low pressureto Pan Access Tube 15, causing used fluid to flow through tube 15 toenter suction port 34 and to be pumped out of an outlet port 38 of pump35 into an outlet line 37 of pump 35. Outlet line 37 is connected tooutlet port 38 at one end and connected to a check valve 39 at the otherend. A three port used fluid delivery line 93 connects check valve 39 toa fluid clarity sensor 81 and to the downstream side of an adjustablerelief valve 91.

[0043] A used fluid delivery line 94 connects clarity sensor 81 to aquick connector 41 which connects line 94 to a used fluid delivery line43 which carries the used fluid extracted from the transmission intoused fluid receptacle 21.

[0044] Used fluid receptacle 21 has an opening with a closure 97 and avent tube 95. Receptacle 21 has volume level indicating marks numberedin quarts (not shown). Input/output lines 4 & 5 are connected to flowalignment valve 45 which is shown in simple terms but can exist in manydifferent forms without departing from the basic principle or art.

[0045] A used fluid delivery line 92 connects one port of a main on-offvalve 49 to an adjustable relief valve 91. (Main valve 49 is acombination, multi-port, two-position flow direction selectorvalve-ports are not shown numbered specifically. ) A fluid delivery line47 is connects one port of main valve 49 to one port of flow alignmentvalve 45. Fresh fluid receptacle 23 is connected to a suction tube 69which is in turn connected by a quick connector 73 to a fresh fluidsuction line 71 which is connected to a suction port 70 of a main pump65. An opening with closure 76 and a vent tube 78 is provided to freshfluid receptacle 23. Receptacle 23 has volume indicating marks presentsimilar to used fluid receptacle 21, but reversed to illustrate quartsof used fluid deposited (marks not shown).

[0046] Main pump 65 can be activated by an electric power supply switch67, and when activated pumps fresh fluid through an outlet port 64, intoa fresh fluid delivery line 63 and through adjustable flow regulator 61.A fresh fluid delivery line 59 connects regulator 61 to a combinationrate of flow and total volume of flow indicator/meter which indicatesrate of flow and volume of fresh flow delivered, a fresh fluid flowrate/totalizer meter 57. Fresh fluid delivery line 51 connects meter 57to main valve 49. A fluid delivery line 47 connects one port of mainvalve 49 to one port of flow alignment valve 45.

[0047] A used fluid delivery line 83 connects one port of main valve 49to a bidirectional combination indicator/meter which indicates directionof used flow, rate of used flow, and total volume of used flow, a usedflow rate/totalizer meter 77. A used fluid delivery line 75 connectsmeter 77 to one port of flow alignment valve 45. A three port used fluidbypass line 85 connects two ports of main valve 49 with a sample tap 87.

[0048] Description of Operation of the First Embodiment of FIG. 2

[0049] To initiate the use of the invention, used fluid receptacle 21 isemptied through an opening with closure 97 after disconnecting connector41 and then reconnected to connector 41 so that an empty receptacle isavailable to receive the used fluid extracted from the transmission 9being serviced. Fresh fluid receptacle 23 is filled through an openingin closure 76 while in place, but receptacle 23 can be removed bydisconnecting it at connector 73 to fill it, and then replacing it inposition in the Complete Fluid Exchanger System 20 (FIG. 1) andreconnecting connector 73. In heavy duty or fleet applications, it iscommercially useful to connect the invention to receptacles much largerthan receptacles 21 & 23, but because the operating principles remainthe same, it should be considered an extension of this same art andpractice.

[0050] The cooling circuit 27/11/29 is opened at port 28 where line 29is connected to cooler 11. The operator's selection of the location toopen cooling circuit 27/11/29 at port 28 is random and made at thepreference of the operator as a matter of ease and convenience. Thereare a number of other areas circuit 27/11/29 is suitable for opening,including connection 26.

[0051] Stem 12 is connected to the outlet side of the opened coolingcircuit, outlet line 27 by connecting it to port 28 of cooler 11 andstem 10 is connected to the inlet side of the opened cooling circuit byconnecting it to connector 30 of cooling return line 29. The invention'sinput/output hoses 4 & 5 are randomly connected to the opened coolingcircuit 27/11/29, but in this illustration for sake of exampleinput/output hose 4 is connected to cooling return line 29 through stem10, and input/output hose 5 is connected to cooling outlet line 27thought cooler 11 and stem 12. Pan Access Tube 15 has been inserteddirectly into the bottom of pan 19 by pushing it down dipstick/fillertube 18.

[0052] The invention is now ready to be operated. The vehicle is startedand run with the transmission in park and the fluid level of pan 19 ischecked and corrected if out of the range desired. The used fluidcontained in transmission 9 is now circulating through cooling line 27into hose 5 through stem 6 which is connected to hose 5 by quickconnector 16 and into the invention, through the invention, and out ofthe Complete Fluid Exchanger 20 (FIG. 1) and back through hose 4 andinto the cooling return line 29 as the Complete Fluid Exchanger 20(FIG. 1) functions in an Off/bypass mode with the transmission operatingin park (indicated with dotted lines at main valve 49). The used fluidflows from line 27 to hose 5 to flow alignment valve 45, through valve45 into line 75 to used meter 77.

[0053] The used fluid from hose 5 then flows from meter 77 through line83 to main valve 49, through main valve 49 and into bypass line 85 andback through valve 49 to line 47, through line 47 to alignment valve 45,through alignment valve 45 to input/output hose 4, and through quickconnector 14, through stem 10 and into cooling return line 29 whichcarries the used fluid back into transmission 9.

[0054] Flow alignment valve 45 is controlled in response to thedirection of flow indicated at meter 77. Flow alignment valve 45 is atwo position flow direction selector valve which switches direction offlow between lines connecting valve 45 and main valve 49, thus providingthe capability to randomly connect the input/outlet hoses 4 & 5 toeither side of opened cooling circuit 27/11/29. Alignment valve 45permits quick alignment of the direction of flow in cooling circuit27/11/29 with the direction of flow in the two main subsystems, the usedfluid extraction system and the fresh fluid introduction system whichare contained in the Complete Fluid Exchange System. In the embodimentillustrated in FIG. 2 valves 45 & 49 and used flow meter 77 aremechanically operated and can also be electrically operated,microprocessor controlled, and electronically indicating. While verysophisticated electronic microprocessor combinations can be used to makethe contents of the invention more compact, they certainly retain thesame principles or art utilized in FIG. 2 and should not be consideredsignificant variants of the novel art presented herein.

[0055] Also, valves 45 & 49 as depicted in FIG. 2 are illustrated inmost basic form for simplicity of illustration. Various other moredispersed variants comprised of multiple solenoid or manually operatedsubunits can be utilized which operate under the same principle of artwhen examined in unity, but do not vary from the actual scope of what isillustrated in this embodiment.

[0056] If the used fluid is flowing through cooling circuit 27/11/29such that when randomly connected to the invention with valve 49 in itsOff/bypass mode (dotted line) meter 77 indicates that the flow is not inalignment with the invention, then flow alignment valve 45 is actuatedto its second, alternate position which institutes a flow alignmentcondition which is clearly indicated at meter 77.

[0057] Meter 77 then indicates proper flow alignment, and also indicatesthe rate of flow at which the used fluid is being circulated throughcooling circuit 27/11/29 as bypassed through closed loop 85 and theoperator makes note of this.

[0058] Because main valve 49 is in its Off/bypass position (dottedlines), the used fluid passes only through the valve ports connected toboth sides of bypass line 85. The operator then uses sample tap 87 todraw a sample of the used fluid circulating in the cooling circuit intoa clear sample vial to later give to the vehicle's owner.

[0059] The engine is then turned off which inactivates transmission 9placing it in a static mode. Electrical supply switch 96 is thenactivated by the operator which activates auxiliary pump 35 whichapplies low pressure to the used fluid in pan 19 via tube 15. Tube 15 isa clear hose which allows the operator to visually monitor the presenceand approximate clarity (estimated degree of non-contamination) of theused fluid which then is forced by air pressure into line 15, throughpump 35 and then deposited in used receptacle 21.

[0060] The actual clarity of the used fluid being extracted is indicatedby clarity indicator 81, which in a microprocessor operated embodiment,provides electronic indicating signals to the microprocessor.

[0061] When the operator notices that the used fluid from pan 19 passingthrough tube 15 runs out and only air is being pushed through the lineby atmospheric air pressure, suggesting the pan is near empty or empty,the operator activates electrical supply switch 67 which activates mainpump 65 which applies low pressure to the fresh fluid contained in tank23 through lines 71 & 69. This causes the fresh fluid to move into inletport 70 of pump 65 where pressure is applied to force it into line 63and all other lines down line from line 63 which will be connected to itwhen main valve 49 is activated.

[0062] The operator then moves main valve 49 to in secondary or Onposition (solid line) which allows the fresh fluid forced into line 63by pump 65 to flow through flow regulator 61 through line 59 to flowmeter 57, through line 51 to the main valve 49 to line 47, through line47 to alignment valve 45, through alignment valve 45 and to input/outputhose 4 and then into the return cooling line 29. As the fresh fluid nowflows through the fresh fluid introduction subsystem of the inventionand into the return side of the opened cooling circuit, it then flows tothe internal transmission components downstream to the return side ofthe cooling circuit and eventually comes to rest in pan 19. As thisfresh fluid so flows, the operator adjusts flow regulator 61 such thatthe rate of flow of fresh fluid approximately matches the rate at whichused fluid was measured at meter 77 to have been circulating at in thecooling circuit when the invention was in bypass mode with thetransmission operating in park. After so operating the invention for abrief period, the operator notices that fluid begins to flow once againthrough tube 15 and later begins to show clarity in tube 15 and at usedclarity sensor 81, suggesting that the return cooling line and itsdownstream components and circuits have been flushed and purged into pan9. As the fluid now moving through tube 15 reaches clarity, the operatorinactivates main valve 49 by moving its selector to the alternateOff/bypass position, which leaves pump 65 on, but not delivering freshfluid into transmission 9 because main valve 49 now has closed freshfluid delivery line 51 (this will not harm the pump because it has aninternal relief/unloader system designed to protect it during thesetimes of running and not delivering fresh fluid into transmission 9).

[0063] The operator then examines the volume indicating marks of bothreceptacles 21 & 23 (not shown specifically) and subtracts theapproximate volume of fresh fluid delivered from the used fluid receivedto calculate the approximate volume of additional fresh fluid that mustnow be pumped into pan 19 through the cooling return line 29 in order tofill it to its normal operating level so the dynamic part of theComplete Fluid Exchange can be instituted. The operator again activatesvalve 49 (with the transmission still not operating) and continuesadding fresh fluid to pan 19 through cooling return line 29 until theadditional calculated amount has been introduced into the pan asindicated on fresh receptacle 23 by its volume indicating marks. Mainvalve 49 is now moved to its Off/bypass mode position once again.

[0064] The static part of the Complete Fluid Exchange has beencompleted. The return cooling line 27 and its downstream circuits andcomponents including pan 19 have been flushed, purged, cleaned and thenrefilled and left holding fresh fluid. Pan 19 is now filled with theproper amount of fresh fluid. Now the operator is ready to institute thedynamic part of the Complete Fluid Exchange.

[0065] The vehicle is now started and idled with the transmission 9placed in park and main valve 49 is simultaneously activated by movingit to its On position which begins the dynamic part of the CompleteFluid Exchange in which fresh fluid is pumped from receptacle 23 intoreturn cooling line 29 and used fluid is extracted out of cooling outletline 27 from the transmission components which were not already flushed,purged, cleaned and refilled during the static part of the CompleteFluid Exchange.

[0066] As main valve 49 is activated, adjustable relief valve 91 isquickly calibrated to cause the rate of flow of used fluid toapproximate the rate of flow of fresh fluid as indicated at fresh flowindicator 77, and an approximate balance between the rate at which freshfluid flows into transmission 9 at and the rate that used fluid flowsout of transmission 9 at now occurs. That is, fresh fluid is now beingintroduced into cooling return line 29 at essentially the sameapproximate rate that used fluid is being extracted from cooling outletline 27.

[0067] The Complete Fluid Exchange is continued at this essentiallybalanced rate of fluid exchange until clarity sensor 81 indicates thatthe fluid being extracted from cooling outlet line 27 is nowsubstantially as clean as fresh fluid which confirms that essentiallyall of the fluid circulating in the transmission is fresh now. This alsoindicates that the transmission has been completely flushed, purged,cleaned and refilled with fresh fluid.

[0068] When the desired clarity of the fluid being extracted fromcooling outlet line 27 is attained as indicated by sensor 81, the mainvalve is inactivated, again placing the invention in its Off/bypass modeand the final fluid sample is taken at tap 87 by the operator who willgive it and the first sample to the vehicle owner or customer.

[0069] The Complete Fluid Exchange System 20 (FIG. 1) is now turned off(even when off it will still allow the transmission's fluid to passthrough its input/output hoses 4 & 5 in either direction, unobstructed).Then the vehicle is turned off as well.

[0070] The operator can examine the volume indicating marks on freshreceptacle 23 which will indicate just how much fresh fluid was used forpurposes of billing the vehicle's owner and for maintaining inventorycontrol of fresh fluid supplies.

[0071] Input/output hoses 4 & 5 are now disconnected at quick connectors14 & 16. Stems 10 & 12 are then disconnected from both sides of theopened cooling circuit at port 28 and connection 30. Cooling return line29 is then reconnected to port 28 at connection 30 to close thepreviously opened cooling system 27/11/29.

[0072] The vehicle is now started with the transmission in park and theoperator checks the cooling circuit for any leaks should the connectionsnot be secure. The operator then checks the fluid level of thetransmission by use of the dipstick (not shown) inserted indipstick/filler tube 18. The Complete Fluid Exchange as instituted byuse of the first embodiment as illustrated in FIG. 2 is now finished.

[0073] Description of the Invention—FIG. 3—the Second Embodiment

[0074]FIG. 3 is an illustration of the second and preferred embodimentof the Invention, the Complete Fluid Exchange System which like theembodiment illustrated in FIG. 2, has been randomly interconnected toboth sides of the opened cooling circuit comprised of cooling outletline 27, transmission 11 inside radiator 13 and cooling return line 29,each of which form together as connected, the complete cooling circuit27/11/29 of transmission 9. Both embodiments share most of the integralcomponents and/or means utilized. The second and preferred embodiment iselectrically powered and electronically controlled by a microprocessorsystem provided with suitable software. The microprocessor receiveselectronic indicating signals from electronically indicating sensors andmeters, processes them according to the software specifications and thenelicits electronic command signals to individual components which areelectronically controlled and electrically powered. The specific wiringharness, microprocessor parts, circuits and connectors are not includedin FIG. 3 for sake of brevity and because they are quite basic to theirart. Lack of specific inclusion of all microcircuit diagrams, which aremicroscopic, and lack of inclusion of all wiring, connection and powersupply specifics should not be construed to limit the scope of the novelart inclusive to this embodiment.

[0075] Input/output lines 4 & 5 are shown interconnected to both sidesof the cooling circuit comprised of 27 & 29 with line 4 connected toline 29 via stem 10 which is connected to the end of line 29 which wasdisconnected from port 28. Line 5 is connected to line 27 via stem 12which is connected opened port 28 which also at the same time connectsline 5 to a cooler 11 located in radiator 13. One end of Pan Access Tube15 is connected to the one port of an auxiliary three way valve 100 andthe other end of tube 15 has been inserted down dipstick/filler tube 18and to the bottom of pan 19.

[0076] A three port used fluid delivery line 89 connects a combinationused fluid flow rate/totalizer meter 121 to one port of main valve 49and to one port of the auxiliary valve 100. A three port used fluiddelivery line 90 connects meter 121 to a check valve 117 and to port 34of auxiliary pump 35. Pump 35 has an outlet port 38 which is connectedto a three port used fluid delivery line 37 which connects port 38 tocheck valve 117 and to a fluid clarity sensor 81. A used fluid deliveryline 94 connects clarity sensor 81 to connector 41 which is connected toa used fluid delivery line 43 which extends into a used reservoir 21.Used reservoir 21 is provided with opening with closure 97 and vent tube95. A used fluid delivery line 75 connects flow alignment valve 45 to acombination flow direction, rate of flow meter 119 which is connected tomain valve 49 by a used fluid delivery line 79.

[0077] Input/output hoses 4 & 5 are connected to a flow alignment valve45 which is shown in simple terms but can exist in many different formsor combinations without departing from the basic principle or art. Thereare many different ways to organize smaller solenoid valves and similarmeans to attain the same principles of novel art contained in thisembodiment and it should be assumed that it is not necessary to listevery single alternative possible to define the spirit and method ofsuch novel art.

[0078] A fluid delivery line 47 is connected to one port of flowalignment valve 45 at one end and to one port of main valve 49 whichserves as a combination, two position, on/off valve with two modes ofoperation. One mode results when main valve 49 is in the Off/bypassposition (dotted lines) where lines 47 and 79 are connected together bya used fluid bypass line 85 which is also connected to sample tap 87.The second mode results when main valve 49 is in the On position (solidlines) where line 47 is connected to line 102 and line 79 is connectedto a 3 ported used fluid delivery line 89.

[0079] Main valve 49 is shown in simple terms but can exist in manydifferent much more sophisticated, complex forms without departing fromthe basic principle or art. The ports are not numbered for sake ofsimplicity and due to common understanding of one knowledgeable in theart.

[0080] Fresh fluid receptacle 23 is connected by suction tube 69 whichis in turn connected by connector 73 to fresh fluid suction tube 71which transports fresh fluid into the inlet port 70 of main fresh fluidpump 65. Opening with closure 76 and vent tube 78 is provided to freshfluid receptacle 23. Main pump 65 is electrically powered by a sourceenergized by switch 67. Outlet port 64 of pump 65 is connected toadjustable flow regulator 61 by a fresh fluid output delivery line 63. Afresh fluid delivery line 59 connects adjustable flow regulator 61 tofresh fluid flow rate/totalizer meter 57. Fresh flow meter 57 isconnected by fresh fluid delivery line 55 to a fluid proportioning valve101, which is comprised in this case of an adjustable relief valve whichhas two ports. One port, the regulated port, is connected by a freshfluid delivery line 102 to one port of main valve 49. The other port,the relieved port, is connected by a fresh fluid delivery line 103 to aport on auxiliary valve 100.

[0081] Each of these valves is connected via a wiring harness to amicroprocessor system which receives electronic indicator signals, andprocesses them according to the suitable software design installed inthe microprocessor assembly. The microprocessor assembly, afterprocessing indicator signals according to the software design, thenelicits electronic command signals to appropriate valves and controlswhich are electronically activated and electrically powered. In thismanner, then, many of the invention's operations are instituted.

[0082] It should be understood that if all of these valves andindicators were strictly mechanical and manually operated instead ofelectrically powered, electronically controlled and operated asdescribed in this embodiment, there would be no significant differencein scope or function from the principles of novel art utilized in thisinvention.

[0083] It should also be understood that there are many different waysto pump fluid, that is, there are many different suitable ways to applypressure to fluid for purposes of forcing it through a line and a numberof ways to apply low pressure to the fluid in a line such thatatmospheric or air pressure will force it through that line in thedirection of the low pressure as intended. Pumping systems can bepowered by gravity, heat, electricity, fuel operated motors, and othermeans. The actual means used to apply pressure or low pressure to thefluid is not important, but it is the principle of the art which isimportant as expressed in the overall function of the pumping system andwhat it can attain. It should not be construed that by not listing allpossible specific pumping possibilities by including numerous additionalembodiments with minor changes to illustrate them, that the scope of theart illustrated in this embodiment is in any way limited by suchconstraint which was exercised for sake of brevity.

[0084] All possible design layouts and similar combinations within thescope of this novel art have not been included for the sake of brevity.Minor changes in layout which do not significantly depart from thespirit of this art should not be construed to be significantlydivergent.

[0085] Description of Operation of the Second Embodiment Illustrated inFIG. 3

[0086] To initiate the use of the invention, used fluid receptacle 21 isemptied through tank access cap 97 after disconnecting connector 41 andthen reconnected to connector 41 so that an empty receptacle isavailable to receive the used fluid extracted from the automatictransmission being serviced. Fresh fluid receptacle 23 has been filledthrough tank access cap 76 with the tank in place, but tank 23 couldhave been removed by disconnecting it at quick connector 73, filling itand then returning it into position in the invention 1 (FIG. 1) andreconnecting connector 73.

[0087] In heavy duty or fleet applications, the invention is hooked upto much larger tanks in lieu of receptacles 21 & 23 respectively whichdo not require emptying at each service operation, but only periodicallyafter a substantial number of services depending on the size of thereceptacles. Since the operating principles remain the same, such minormodifications should be considered an extension of this same art andpractice.

[0088] Lines 27 & 29 which connected to a cooler 11 located in thevehicle's radiator 13 comprise the cooling circuit and are designated as27/11/29. Cooling circuit 27/11/29 is opened at a cooler port 28 bydisconnecting cooling line 29 where line 29 is connected to cooler 11.The selection of where to open the cooling circuit 27/11/29 is made atthe preference of the operator as a matter of ease and convenience.There are a number of other areas circuit 27/11/29 could be openedincluding connection 26.

[0089] Stem 10 is connected to the outlet side of the opened coolingcircuit 27 at connector 30 of line 29. Stem 12 is connected to port 28on 11. The invention's input/output hoses 4 & 5 are randomly connectedto the opened cooling circuit 27/11/29, but in this illustration forsake of example are shown as input/output hose 4 connected to coolingline 29 through stem 10, and input/output hose 5 connected to coolingoutlet line 27 through cooler 11 and stem 12. Pan access tube 15 hasbeen inserted directly down into the bottom of pan 19 by pushing it downdipstick/filler tube 18.

[0090] The invention is now ready to be operated. The vehicle is startedand run with the transmission in park and the fluid level of pan 19 ischecked. If it is not at the normal operating level that is corrected.The invention is turned on by activating an on/off power switch on thecontrol panel which is not shown for sake of brevity.

[0091] The used fluid contained in transmission 9 is now circulatedthrough cooling outlet line 27 into hose 5 into, through and then out ofthe Complete Fluid Exchanger System 20 (FIG. 1) and back through hose 4and into the cooling return line 29 as the invention functions in anOff/bypass mode due to the position that main valve 49 is in (asindicated by the dotted lines).

[0092] The used fluid flows from hose 5 through flow alignment valve 45into line 75 which delivers it to meter 119 which indicates that theused fluid is flowing in the correct direction, and that the inventionis in proper alignment with the direction of flow in the coolingcircuit. Meter 119 also indicates the rate at which the used fluid isflowing through the cooling circuit which has been reclosed by line 85in combination with main valve 49 being in its Off/bypass mode. The usedfluid now flows from meter 119 through line 79 to one port of main valve49, through used fluid bypass line 85, back through main valve 49 andout of valve 49 through line 47 to alignment valve 45 and into line 4and finally through cooling return line 29.

[0093] If the direction of flow in the cooling circuit was reversed andnot flowing in alignment with the Complete Fluid Exchange System 20(FIG. 1) it would still flow through a closed loop bypass which flows inand out of main valve 49 through bypass line 85, but meter 119 wouldindicate a non-alignment condition which would automatically signal themicroprocessor which would then trigger a signal to an electric solenoidto move alignment valve 45 to its alternate position, thus establishingalignment between the direction of flow in the cooling circuit of thevehicle being serviced and the direction of flow within the invention asindicated at meter 119.

[0094] The direction of flow of the used fluid through this closed loop)is established by how each one of hoses 4 and 5 were selected to attachto each one of the stems 10 or 12. The invention allows for speedyrandom choice in making this connection by the operator, an importantcommercial consideration. FIG. 3 illustrates correct alignment for sakeof illustration with solid lines at valve 45.

[0095] The used fluid from the cooling outlet line 27 is now flowingthrough the invention in the correct direction through bypass line 85and back into cooling return line 29. The operator now of fluid beforethe Complete Fluid Exchange is instituted and will be given to thevehicle owner or customer along with the second sample that is drawnafter all of the fluid of Transmission 9 has been changed by theComplete fluid Exchange System 20 (FIG. 1).

[0096] Now that the sample is taken, the engine is then turned off whichinactivates transmission 9 placing it in a static mode. The operatoractivates an electrical supply switch mounted on a control panel 25 (seeFIG. 1 for the location of the control panel, details not shown) whichactivates the microprocessor which in turn closed the power supplyswitch 95 thereby activating the auxiliary pump 35 which applies lowpressure to the used fluid in pan 19 via tube 15 through auxiliary Valve100 which is at rest in its off position (dotted line).

[0097] This application of low pressure into and through tube 15 resultsin the fluid contained in pan 19 moving up into tube 15 and throughvalve 100, through line 89 through meter 121 through auxiliary pump 35and out of pump 35 through line 37, through clarity sensor 81 andthrough line 43 and into the used reservoir 21. When clarity sensor 81indicates a lack of fluid clarity, the microprocessor activates freshfluid supply pump 65 by closing electric supply switch 67 and activatesmain valve 49 placing it in its On position (indicated by solid lines).

[0098] The activation of pump 65 with valve 49 results in fresh fluidbeing forced from port 64 of pump 35 through line 63 through adjustableflow regulator 61, through line 59 through meter 57, through line 55 toadjustable relief valve 101 (used as a proportioning valve set tominimum line pressure necessary to prevent starvation in line 29) andinto line 102, through main valve 49 to line 47, through alignment valve45, to hose 4 which carries the fresh fluid into the cooling returnline. This fresh fluid flushes, purges, cleans and refills those downline transmission components while simultaneously depositing thediluted, mixture of clean and used fluid in the pan 19 (FIG. 1) where itis forced out by atmospheric air pressure through tube 15 and intoreceptacle 21, while pump 35 is still running and connected to tube 15.Proportioning valve 101 is a spring loaded relief type valve which isset to keep a minimum pressure on the return cooling line 29 in therange of 10-15 PSI, such that there will not be any fluid starvationtype conditions, or overpressurization down-line which could damagedownstream transmission components. This valve is set such that themajority of the fresh fluid being introduced into transmission 9 will bethrough Pan Access Tube 15 for most vehicles.

[0099] The mixed, diluted fluid from the down line components of thecooling return line 29 is deposited and removed by tube 15 as it isdeposited in pan 19 (FIG. 1) with increasing clarity as time passes. Assoon as clarity sensor 81 indicates that the fluid being extractedthrough tube 15 is essentially as clean as fresh fluid, themicroprocessor sends a command signal to turn off main valve 49 andanother signal to turn on the auxiliary valve 100 (solid line) such thatit allows fresh fluid to be pumped into the pan directly through tube 15from pump 65 until the pan has been filled. This amount has beencalculated by the microprocessor based on previous signal input frommeter 121, which has indicated how much fluid was extracted so far.

[0100] The microprocessor will move switch 67 to its Off position whenit receives a signal from fresh fluid totalizer meter 57 that the sameamount of fluid has been pumped out of fresh fluid reservoir 23 that hasbeen received in used fluid reservoir 21 as indicated by meter 121. Thisresult will cause a toned/lighted signal to be given off by themicroprocessor through an indicator mounted on control panel 25 (FIG. 1,not specifically shown) to signal the operator that the static part ofthe Complete Fluid Exchange is now complete and both pumps 65 & 35 aredeactivated. Now the operator is ready to institute the dynamic part ofthe Complete Fluid Exchange.

[0101] The vehicle is started and run with the transmission in park.Meter 119 indicates to the microprocessor that used fluid is flowing outof the cooling outlet line into used fluid bypass line 85 and thiscauses the microprocessor to send command signals which simultaneouslyactivate both pumps 65 & 35, and at the same time move main valve 49 toits On position (solid line) and also move auxiliary valve 100 to its Onposition (solid line). This combination of signals cause fresh fluid tobe pumped through hose 4 into the return cooling line 29 and throughtube 15 directly into the transmission pan, both simultaneously.

[0102] At the same time fresh fluid is being pumped into thetransmission at two different entry points (pan 19 and return coolingline 29), auxiliary pump 35 is applying low pressure to line 37 whichincreases the flow of used fluid out of the transmission through coolingoutlet line 27, especially in low flow situations occasionallyencountered with small foreign type designed transmissions. This usedfluid which is being pumped out of transmission 9 through cooling outletline 27, ending up in used reservoir 21, is pumped out by force appliedby transmission 9's own internal pump, added to the low pressure appliedfrom pump 35.

[0103] The rate at which used fluid is being extracted from the coolingoutlet line 27 and into used receptacle 21 is measured by meter 121. Theoverall sum/total rate at which fresh fluid is being pumped into thetransmission through lines 15 and 29 is indicated by meter 57. This rateis kept closely matched to the rate of used fluid extraction asindicated by meter 121.

[0104] The balance maintained between the total amount of fresh fluidintroduced into the transmission (from both loci, Pan Access Tube 15 andhose 4) with the total amount of used fluid extracted is based on themicroprocessor's comparative processing of indicating signals from meter121 and meter 57. The microprocessors command signals to adjustable flowregulator 61 places total fresh fluid flow at the desired levels duringthe dynamic part of the Complete Fluid Exchange.

[0105] This process of introducing fresh fluid at two different lociinto transmission 9 at an overall rate which is balanced to the rate atwhich used fluid is being extracted continues until clarity sensor 81indicates that the used fluid being extracted has the same essentialclarity as fresh fluid.

[0106] At this point the microprocessor sends command signals todeactivate both pump 65 and pump 35 and to move main valve 49 back toits Off/bypass position. This allows the fluid to now once againcirculate through bypass line 85. The operator now takes the final fluidsample from tap 87 which has the same clarity of the fluid circulatingin the cooling circuit 27/11/29, which also has the same essentialclarity as the last volume of fluid which passed through clarity sensor81. The dynamic part of the Complete Fluid Exchange is now over and thevehicle's engine is stopped.

[0107] Hoses 4 & 5 are now disconnected at connectors 14 & 16. Stems 10& 12 are then disconnected from both sides of the opened cooling circuitat port 28 and connector 30. Cooling return line 29 is then reconnectedto port 28 at connector 30 to reclose the opened cooling system27/11/29.

[0108] The vehicle is now started with the transmission in park and theoperator checks the cooling circuit for any leaks should the connectionsnot be secure. The operator then checks the fluid level of thetransmission by use of a dipstick (not shown) inserted indipstick/filler tube 18.

[0109] The complete Fluid Exchange as instituted by use of the secondembodiment as illustrated in FIG. 3 is now finished. The operator turnsoff the Invention and moves it out of position so that the vehicle canbe moved. Periodically the microprocessor is downloaded to monitor freshfluid usage for purposes of inventory control.

[0110] Summary, Ramifications and Scope of Invention

[0111] Thus the reader will see that the Complete Fluid Change Systemprovides a unique, highly effective, convenient, compact, easy tooperate, rapid and cost efficient device to institute a Complete FluidExchange in vehicular automatic transmissions.

[0112] The device allows the operator to provide Complete FluidExchanges to vehicular automatic transmissions faster and easier, usingless fresh fluid in the process. It provides before and after fluidsamples for vehicle owners. For these reasons mentioned, it is novel artthat is commercially useful and valuable in the automotive and vehicularmaintenance industry.

[0113] While my above description contains many specifics, these shouldnot be construed as limitations on the scope of the invention, butrather as exemplification of two embodiments thereof. For example, thereare many similar ways to illustrate certain of the device's valve andindicator functions as numerous single entity components organized inmore complex fashion while functioning in the same overall manner asillustrated in my figures and described in my specifications. Thesevariants should not be construed as significantly different from thenovel art presented in my specifications or claims but should beconsidered as a part of this same novel art my device is based on. Thesemany possible small changes and alternative methods to express the sameprinciples of the novel art of my device are not important enough toillustrate in the drawings. Accordingly, the scope of the inventionshould be determined not by the embodiments illustrated, but by theappended claims and their legal equivalents.

[0114] Used fluid is extracted at only one locus during the static partof the invention's Complete Fluid Exchange, but in future relatedembodiments may be extracted from other loci simultaneously or in unisonfrom additional loci or ports available on or in the transmission andshould be considered direct use of this novel art.

[0115] Used fluid may also be extracted at more than one loci during theinvention's dynamic part of the complete total fluid exchange inadditional embodiments and should then be considered direct use of thisnovel art.

1. A method for exchanging a used fluid with a fresh fluid in a vehiclehaving an automatic transmission connected to a fluid circuit, said usedfluid initially being contained within said transmission and said fluidcircuit, at least a substantial portion of which is subsequentlydischarged into a receptacle, said fresh fluid initially being containedin a source container, said method comprising the steps of: providing afluid exchange system having a first conduit for communicating fluidfrom the transmission, a second conduit for communicating fluid to thetransmission, and a bypass conduit for selectively communicating fluidbetween the first conduit to the second conduit; coupling the first andsecond conduits of the fluid exchange system into an accessed fluidcircuit; establishing a first bypass condition by selectively couplingsaid bypass conduit between the first and second conduits so that usedfluid from the fluid circuit is received into the first conduit and ispassed through the bypass conduit and into the second conduit wherebyused fluid is reintroduced into the accessed fluid circuit; andestablishing a second exchange condition by selectively uncoupling thebypass conduit between the first and second conduits so that used fluidfrom the fluid circuit is received into the first conduit and freshfluid is received into the second conduit and introduced into theaccessed fluid circuit.
 2. A fluid exchange system for use in exchanginga used fluid with a fresh fluid in a vehicle having an automatictransmission and a fluid cooling circuit, said automatic transmissionhaving an internal fluid pump to conduct a circulated fluid in the fluidcooling circuit, said fresh fluid being contained in and dispensed froma source external to said vehicle, said used fluid initially beingcontained within said vehicle and discharged into a receptacle externalto said vehicle, said fluid exchange system comprising: a first fluidline intercoupled to the fluid exchange system and the fluid coolingcircuit to conduct fluid from the cooling circuit; a second fluid lineintercoupled to the fluid exchange system, the source, and the fluidcooling circuit to conduct fluid into the cooling circuit; a bypassfluid line intercoupled between the first fluid line and the secondfluid line; and a selectively controllable bypass fluid line valve forcontrolling fluid communication between the first and second fluidlines, said valve defining a pair of operational conditions including: afirst operational condition wherein used fluid is received into thefirst fluid line, passed through the bypass fluid line, passed into thesecond fluid line, and reintroduced into the cooling circuit, and asecond operational condition wherein used fluid is received into thefirst fluid line and fresh fluid is received into the second fluid lineand introduced into the cooling circuit.
 3. A method for exchanging aused fluid with a fresh fluid in a vehicle having an automatictransmission, said used fluid initially being contained within saidtransmission, at least a substantial portion of which is subsequentlydischarged into a receptacle, said fresh fluid initially being containedin a source container, said method comprising the steps of: identifyinga transmission cooling circuit on the vehicle; uncoupling a portion ofthe transmission cooling circuit to provide access to a firsttransmission cooling circuit port and a second transmission coolingcircuit port, one of said transmission cooling line ports directing usedtransmission fluid outwardly under pressure from the automatictransmission; providing a fluid exchange system having a first conduit,a second conduit, and a bypass conduit providing selective fluidcommunication between the first and second conduits; coupling said firstand second conduits of the fluid exchange system to the first and secondtransmission cooling circuit ports; providing fluid communicationbetween the first and second conduits via the bypass conduit; energizingthe transmission to flow used fluid through the first conduit, thebypass conduit, and the second conduit; selectively blocking fluidcommunication between the first and second conduits via the bypassconduit; and flowing used fluid into the first conduit and flowing freshfluid into the second conduit during an exchange procedure.
 4. A fluidexchange system for performing a fluid exchange procedure on anautomatic transmission of a vehicle, said fluid exchange systemcomprising: a first conduit for communicating fluid from thetransmission; a second conduit for communicating fluid to thetransmission; and a bypass conduit for selectively communicating fluidbetween the first conduit and the second conduit, wherein the firstconduit and the second conduit are coupled into an accessed fluidcircuit of the vehicle; and wherein a bypass mode of operation isestablished by selectively coupling said bypass conduit between thefirst and second conduits so that used fluid from the fluid circuit isreceived into first conduit, passed through the bypass conduit, and intothe second conduit so that used fluid is reintroduced into the accessedfluid circuit; and wherein an exchange mode of operation is establishedby selectively uncoupling the bypass conduit between the first andsecond conduits so that used fluid from the fluid circuit is receivedinto the first conduit and fresh fluid is received into the secondconduit and introduced into the accessed fluid circuit.
 5. A fluidexchange system of claim 4 further comprising a fresh fluid receptacleand a used fluid receptacle, at least one of the receptacles beingremovable from the exchange system for refilling or emptying purposes.6. A fluid exchange system for use in exchanging a used fluid with afresh fluid in a vehicle having an automatic transmission and a fluidcooling circuit operatively connected to conduct a circulated fluidtherein, said fresh fluid being contained in and dispensed from a sourceexternal to said vehicle, said used fluid initially being containedwithin said vehicle and discharged into a receptacle external to saidvehicle, said fluid exchange system comprising; a first fluid lineintercoupled to the fluid exchange system, the source, and the fluidcooling circuit to conduct fresh fluid from the source into the fluidcooling circuit, said conducted fresh fluid having a first fluid flowrate; a second fluid line intercoupled to the fluid exchange system andthe fluid cooling circuit to conduct used fluid from the coolingcircuit, said used fluid having a second fluid flow rate; a pumpoperatively coupled to the second fluid line for assisting in anextraction of used fluid from the cooling circuit; and a control deviceoperatively coupled to the first fluid line or the second fluid line tosubstantially balance the first fluid flow rate with the second fluidflow rate during an exchange procedure.
 7. A fluid exchange system ofclaim 6 further comprising a fresh fluid receptacle and a used fluidreceptacle, at least one of the receptacles being removable from theexchange system for refilling or emptying purposes.
 8. A method forexchanging a used fluid with a fresh fluid in a vehicle having atransmission connected to a fluid circuit for conducting a circulatedfluid therein in an operational direction, said used fluid initiallybeing contained within said transmission and said fluid circuit, atleast a substantial portion of which is subsequently discharged into areceptacle, said fresh fluid initially being contained in a sourcecontainer, said method comprising the steps of: providing a fluidexchange system having a first conduit for communicating fresh fluid tothe transmission and a second conduit for communicating used fluid fromthe transmission, said fluid exchange system having a fluid flowalignment valve; determining the direction of flow of the circulatedfluid within the fluid circuit; operating said fluid flow alignmentvalve to align the flow of the fresh fluid relative to the flow of thecirculated fluid within the fluid circuit; and delivering a quantity ofthe fresh fluid sufficient to substantially replace the used fluidwithin the transmission and the fluid circuit from the source containerinto the transmission and the fluid circuit within the vehicle as theused fluid is expelled from the transmission and the fluid circuit intothe receptacle at substantially equivalent volumetric flow rates.
 9. Amethod for using a fluid exchange system for exchanging a used fluidwith a fresh fluid in a vehicle having an automatic transmission and afluid cooling circuit operatively connected to conduct a circulatedfluid therein, said transmission having a dipstick filler tube, saidfresh fluid being contained in and dispensed from a source external tosaid vehicle, said used fluid initially being contained within saidvehicle and discharged into a receptacle external to said vehicle, saidmethod comprising the steps of: providing a first fluid line fluidlycoupling the fluid exchange system, the source, the fluid coolingcircuit, and transmission dipstick filler tube to conduct fresh fluidfrom the source into both the fluid cooling circuit and the dipstickfiller tube, said conducted fresh fluid having a first fluid flow rate,providing a second fluid line interconnected to the fluid exchangesystem and the vehicle to conduct the used fluid from the vehicle, saidused fluid having a second fluid flow rate; and providing a controlassembly operatively coupled to the first fluid line or the second fluidline to substantially balance the first fluid flow rate with the secondfluid flow rate during an exchange procedure.
 10. In a machine forexchanging used fluid from an automotive automatic transmission withfresh fluid, said machine comprising: a source of fresh fluid; a pumpunit flowing fresh fluid from the source to the automatic transmission;and a flow alignment valve including four fluid ports, each of said fourports being in direct fluid flow communication with at least one otherof said four ports, two of said ports being bi-directional ports whichmay receive used fluid from the transmission or send fresh fluid to saidtransmission, and a different two of said ports being respectively aninflow port at which said machine receives used fluid from thetransmission and an outflow port to which the machine delivers newfluid.
 11. The machine of claim 10 wherein the flow alignment valveincludes a single valve body and each of said four ports being in directfluid flow communication with only one other of said four ports.
 12. Themachine of claim 10 wherein the flow alignment valve is manually biasedby an operator during an exchange procedure.
 13. The machine of claim 10wherein the flow alignment valve is controlled by an electronic controlsystem.
 14. A machine of claim 10 further comprising a fresh fluidreceptacle and a used fluid receptacle, at least one of the receptaclesbeing removable from the machine for refilling or emptying purposes. 15.A method of exchanging used fluid with a fresh fluid in an automotiveautomatic transmission having an internal pump and an external fluidcirculation loop, said method comprising steps of: providing a volume offresh fluid; providing a pump unit flowing fresh fluid from a source tothe automatic transmission; and providing a flow alignment valveincluding four fluid ports, each of said four ports being in directfluid flow communication with at least one other of said four ports, twoof said ports being bi-directional ports which may receive used fluidfrom the transmission or send fresh fluid to said transmission, and adifferent two of said ports being respectively an inflow port at whichsaid machine receives used fluid from the transmission and an outflowport to which the machine delivers new fluid.
 16. The method of claim 15wherein the flow alignment valve includes a single valve body and eachof said four ports being in direct fluid flow communication with onlyone other of said four ports.
 17. The method of claim 15 wherein thevalve is manually biased by an operator during an exchange procedure.18. The method of claim 15 wherein the valve is controlled by anelectronic control system.